JPS6232975Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to the drawing of optical fibers, and more specifically, to the drawing of optical fibers, it is possible to eliminate the slack that occurs between the first capstan and the second capstan, and to improve the quality of the drawing process. The present invention relates to an optical fiber drawing device capable of producing optical fiber strands.

<Prior art> In the optical fiber drawing process, the optical fiber is drawn from the first capstan due to the respective resistances while passing through the direction changing sieve, the buffer layer coating device, and the drying oven to the second capstan.
Looseness occurs when it exits the capstan. 1
On the other hand, the surface of the primary coating layer is slightly sticky, making it difficult to separate from the first capstan. Therefore, if the optical fiber becomes slack when it exits the first capstan, the optical fiber may stick to the first capstan, and the slack may become even larger and wrap around the first capstan, eventually leading to breakage.

In order to solve this problem, we set the transmitting side of the Sershin motor on the rotating shaft of the first capstan,
It has been proposed that the receiving side is set on the rotation axis of the second capstan to synchronize the rotations of both the first and second capstans. However, in this case, if a slip occurs between the optical fiber coated with the buffer layer and the second capstan, there is no place to absorb the resulting slack, and the slack is left as it is when it exits the first capstan. appear. The optical fiber is delayed in separating from the first capstan due to the viscosity of the primary coating layer, and passes through the optical fiber distorted. At the same time, the vibration of the optical fiber passing through increases, which adversely affects the coating of the buffer layer. It turns out.

<Objective> An object of the present invention is to solve the conventional problems and provide a drawing device that can perform good drawing while preventing the optical fiber from becoming loose during the drawing process of the optical fiber.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention includes a base material support section, a base material heating furnace, a primary coating device, a drying furnace, a first capstan, a direction change sheave, and a buffer layer coating. equipment, drying oven, second capstan,
In an optical fiber drawing device in which a dancer roller and a winding device are sequentially arranged, the rotating shaft of the second capstan is rotated by a variable rotation speed electric motor, and the rotating shaft and the second capstan are slidable in the rotational direction. It is characterized by being engaged with.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a layout diagram of the optical fiber drawing device of this embodiment, and FIG. 2 is an enlarged view of the main parts of the same device.
In these figures, 1 is the optical fiber base material and X-
It is held by a base material support part 2 that can be centered using a Y table. Optical fiber base material 1 is a base material heating furnace 3
The fiber is heated and spun to a predetermined thickness, passes through a primary coating device 4 and a drying oven 5 to be coated with a primary coating, and then passes through a first capstan 6 and advances upward. Then, it passes through a direction change sieve 7 and a buffer layer coating device 8, where a buffer layer is coated on the first coating layer, and then passes through a drying oven 9 and reaches a second capstan 10.

A geared motor 11, which is a variable rotation speed electric motor, is set on the rotating shaft 12 of the second capstan 10, and adjusts the circumferential speed of the second capstan 10 to be 1% to 20% faster than that of the first capstan 6. The output shaft of the motor 11, that is, the rotating shaft 12 of the second capstan 10, and the second capstan 10 are slip-coupled by fluid, so that a slip resistance of 10 g to 100 g is exerted on the circumferential surface of the second capstan 10. I have to.

Optical fiber 1 passed through second capstan 10
4 is wound up on a winding drum 17 set in a winding device 16 via a dancer roller 15.

In the above embodiment, the geared motor 11 is used as the variable rotational speed electric motor, but the present invention is not limited to this, and other reduction gears may be used. Furthermore, other than fluid slip coupling, other known coupling means may also be used. Further, in this embodiment, both the first and second capstans 6,
The reason why the circumferential speed difference of 10 is set to 1% to 20% is because if it is less than 1%, the slack absorption effect will not appear, and if it exceeds 20%, the slip will increase and the tension will become unstable, which is not desirable. be. In addition, the slip resistance on the circumferential surface of the capstan was set to 10g to 100g.
This is because if it is less than 100 g, the slack absorption effect will not be exhibited, and if it is more than 100 g, the quality of the optical fiber will be affected.

<Effects> As described above, the optical fiber drawing device according to the present invention does not cause any slack in the optical fiber during drawing, and therefore prevents the optical fiber from wrapping around the first capstan and breaking, or from loosening the optical fiber. There is no occurrence of coating defects due to vibration, and a good optical fiber wire can always be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a layout diagram of an optical fiber drawing device, and FIG. 2 is an enlarged view of the main parts of the device. 1... Optical fiber base material, 2... Base material support portion, 3
...Base material heating furnace, 4...Primary coating device,
5... Drying oven, 6... First capstan, 7...
Direction change sieve, 8...Buffer layer coating device, 9...Drying oven, 10...Second capstan,
11... Variable rotation speed electric motor, 12... Rotating shaft, 1
5... Dancer roller, 16... Winding device.

Claims (1)

[Claims for Utility Model Registration] (1) Base metal support section, base metal heating furnace, primary coating device, drying furnace, first capstan, direction changing sieve, buffer layer coating device, drying furnace, second
In an optical fiber drawing device in which a capstan, a dancer roller, and a winding device are sequentially arranged, the rotating shaft of the second capstan is rotated by a variable rotation speed electric motor, and the rotating shaft and the second capstan are slid in the rotation direction. An optical fiber drawing device characterized by dynamic engagement. (2) The optical fiber drawing apparatus according to claim 1 of the above-mentioned utility model registration, characterized in that a slip resistance of 10 g to 100 g is generated on the circumferential surface of the second capstan.